Hydraulic connection for presses



Aug. 9, 1932. R. J. PARDEE 1,870,527

HYDRAULIC CONNECTION FOR PRESSES Filed Nov, 24. 1931 '7 Sheets-Sheet l l' JIIUHMII Aug. 9, 1932. R. J. PARDEE HYDRAULIC CONNECTION FOR PRESSES Filed Nov. 24, 1951 7 Sheets-Sheet 2 Aug. 9, 1932. R J PARDEE 1,870,527

HYDRAULIC CONNECTION FOR PRESSES Filed Nov. 24, 1931 7 Sheets-Sheet 3 Aug. 9, 1932.

R. J. PARDEE 1,870,527

HYDRAULIC CONNECTION FOR PRESSES Filed Nov. 24, 1931 7 Sheets-Sheet 5 R. J. PARDEE HYDRAULIC CONNECTION FOR PRESSES Filed Nov. 24, 1931 7 Sheets-Sheet 6 GM, @m M attcmmg Aug. 9, 1932. R. J. PARDEE' 1,870,527

HYDRAULIC CONNECTION FOR PRESSES Filed Nov. 24, 1931 7 Sheets-Sheet 7 Patented Aug. 9, 1932 UNITED STATES PATENT OFFICE ROBERT J. PARDEE, F CLEVELAND HEIGHTS, OHIO, ASSIGNOR TO THE CLEVELAND ff PUNCH & SHEAR WORKS COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO HYDRAULIC Application filed November 24, 1931.

This invention relates generally to hydraulic presses and other similar machines and more particularly to means for connecting a high pressure accumulator with such machines.

In my co-pending application Serial No. 525,667, I have disclosed and claimed a briquetting machine which includes a reciprocable cylindrical sl de or cross head operated from a shaft and having a fixed stroke. Yieldably mounted in the cylinder slide is a piston which is adapted to move with the cylinder slide under certain conditions and to move with respect to the cylinder slide when the pressure on the piston exceeds a predetermined amount. The piston is slidably mounted in the cylinder slide and is connected with an accumulator which exerts a constant pressure on the piston so that when the pressure of the plunger against a briquette exceeds the predetermined pressure behind the piston the piston will yield or move with respect to the cylinder slide. In view of the fact that the pressure behind the piston in a machine of this character is exceedingly high, (between 4000 and 6000 lbs. per square inch), it is necessary to make use of a nonfiexible connection between the accumulator and the piston. The invention in this case is directed to such a connection.

Such a connection is applicable and useful in connection with a draw press or other similar machine wherein it is desired to provide rigid connection between an accumulator and a reciprocatory cross head or cylinder slide.

The main object of the invention is to provide a connection of the character described which consists of few parts and which will permit the piston to yield or move with respect to the cylinder slide or cross head when the pressure thereon exceeds a predetermined amount; and which at the same time will be safe and dependable in operation.

Further and more limited objects of the invention will appear as the description proceeds and by reference to the accompanying drawings in which Figs. 1 and 1A taken together are vertical sectional views of a briquetting machine having my improvedcon- CONNECTION FOR PRESSES Serial No. 577,071.

nection thereon and showing the parts in the backward position, that is to say, the position which the parts occupy just prior to the beginning of the compression stroke; Figs. 2 p and 2A are views similar to Figs. 1 .and 1A showlng the parts as they appear at the end of the compression stroke; Fig. 3 is a transverse sectlonal vlew taken on the line 33 of Fig. 1; Fig. 4 is a fragmentary vertical sectional View disclosing my connection as applied to a draw press and Fig. 5 is a view in front elevation of the draw press disclosed in Fig. 4.

The details of the briquetting machine form no part of this invention and are disclosed and claimed in my co-pending application hereinbefore referred to; and only such parts of the machine will be described as to bring out the utility of the features the medium of a belt 13 which operates a pulley 14; mounted on a shaft 15, on which is mounted a gear 16 which meshes with and drives a gear 17 mounted on a shaft 18. The shaft 11 is driven from the shaft 18 through suitable gears (not shown). Journaled in the front of the machine is a crank shaft 20 which is driven from the drive shaft 11 by any suitable means (not shown). Slidably mounted on the rear portion of the frame of the machine is a rear slide 21 which is operated from the shaft 20 by means of crank 22 and connecting rod 23. Also slidably mounted on the frame of the machine is a front slide 2st which is connected with the rear slide 21 by means of tie rods 25 and 26. Disposed between the rear slide 21 and the front slide 24'is a mold block 27 which is rigidly connected to a stationary part of the frame. Carried by the front slide 24 and movable therewith is a stripper 28 which moves with the front slide. Carappear.

ried by the stripper and detachably connected therewith is a mold or forming die 29 which surrounds the mold block 17. Carried by the frame of the machine is a hopper 30 in the lower end of which is arranged a block 31 having a longitudinally extending bore or opening 32 therethrough and which is disposed in alignment with the mold block 27. The block 31 is also provided with an opening 33 into which the material to be briquetted is fed.

Slidably supported on the front portion of the machine is a cylinder slide or cross head 34 which is connected to the drive shaft 11 by means of a crank 85 and connecting rod 35 :and is operated therefrom with a fixed stroke. Til-8.1CYllIld6I slide or cross head .34 is provided witha cylindrical opening 36 in which is slidably mounted a piston 37 to which is rigidly connected a plunger 38 disposed ;in axial alignment with the bore :32 in the block 31. Extending transversely of the frame members 01 the machine is a supporting bar or member 39 which is rigidly connected with the frame and provided with an opening 40. Disposed adjacent the cross head :or cylinder :slide is a rigid member "11 having a longitudinally extending tubular portion 42 having a bone :or passageway 43 therein which communicates with the transversely extending bore or passageway 44. The tubular portion 12 is :also provided with openings 45 the purpose of which will here-- i The tubular portion 42 extends through a longitudinally extending opening provided .in the cylinder block which is parallel with the axis of the cylindrical opening 36. .A bore 46 connects cylinflmical opening :36 with the passageway 43in the tubular member 41 so as to maintain a constant open communication between the space in the :rear of the piston 37 and the bore 143 in the tubular member. Themember 411E provided with a projecting portion 46 which projects through "the opening .40 in the supporting member '39 and is secured thereto .by means of a nut 47 threadedly secured 'thereover. The opening 40 in the. supporting member 39 thro'ugh which the projection 46 extends is somewhat larger than the projection so that the nut 17 may be tightened to correct 'disalignment between the cylinder "Slide or crossfh'ead and the tubular member .42. Suitable packing glands 48, 49 are provided at the opposite ends of the tubular portion 4:2:so-as to prevent leakage. Leading .trom themember 41 .is a rigid tubular, connection 50 which connects withan accumula- 1501'51 from which leads a connection 5.2 connecting with thfe pressure tank 53. The connection 50 is provided with a valve 54 and 2a pressure indicator 55. From the construction and connections just described, it will be seen :that :the cylinder 3.6 is in constant accumulator. at theforward end of the stroke of the cylcylinder slide bearings resulting in distalignment of the cylinder slide and the tubular portion .42 of the rigid connection which extends theret'hrough, the nut 17 will be loosened to permit the cylinder slide to be adjusted into proper alignment. The nut 17 may then :be tightened to secure the parts :in their proper position.

0 peration In the ordinary operation of this machine,

.a predetermined pressure is supplied to the air pressure chamber 53, which in turn exerts a predetermined pressure upon the accumulator 51 aud t-he cylinder 36 when the valves in the connection 50 are opened. When the motor 12 is set in operation. the drive shaft 11 will be rotated. This rotary motion of the drive shaft will reciprocate the cross head or slide 34 with a definite and fixed stroke. The shaft 20 will also be operated from the drive shaft 11 through any medium (not shown) as is illustrated in my co-pending application hereinbeforc :ferred to. The material to be briquetted is .containedin the hopper 30 and will be .fed .into the bore "32 in the block 31. The parts will then be brought to the position shown in Figs. 2 and '2. The stripper slide will be brought to .a position to close the mold and .the pressure is applied by means of the plunger 38 which is connected with the piston 37. When the pressure of the plunger against the briquet exceeds the predcten mined pressure behind the piston 37, the piston will yieldor move within the cyliinder to the position shown .in Fig. 2. This pressure is determined by the pressure in the It will therefore be seen that incler :slide the. pressure on the plunger is slightly in excess of that behind the piston with the result that each briquet is formed under substantially the same pressure, which out the utility of this connection when used with adraw press, it is only necessary to describe certain essential parts of the draw press.

The draw press consists of a base member 56 on which is mounted a die block 57 which supports a die 58. J ournaled in the upper portion of the draw press is a shaft 59 which may be driven in any suitable manner and which has a crank portion 60 to which is connected a connecting rod 61. Slidably mounted on the draw press is a cross-head or plunger 62 which is disposed between guide blocks 62*. The cross head or slide is connected with the connecting rod 61 by means of a pin 63. The slide 62 is provided with a cylindrical opening 64 in which is mounted a piston 65 having a central bore therein through which extends a plunger or forming die 66 the lower end 67 of which is cylindrical and somewhat larger than the portion 66. Carried by the plunger or piston 66 is a blank holder 68 which is secured thereto by tie rods 69 and 7 O. The slide 62 is provided at one side thereof with a chamber 71 which is connected with the cylindrical opening 64 by means of a bore or passageway 7 2. Disposed at the top of the draw press and extendin transversely thereof is a supporting bar 73 having an opening therein through which extends a tubular member 74 having an opening 75 therein. The tubular member 74 extends through a bore or opening provided in the slide and the opening 75 communicates with the chamber 71. The tubular member is secured in place by means of a nut 7 6 and the axis of the tubular member 7a is disposed parallel to the direction of movement of the slide. Suitable packing glands 77 and 78 are provided about the tubular member to prevent leakage thereabout. Connected with the upper end of the tubular member 7% is a rigid connection 79 which is secured thereto by a union 80. The connection 79 leads to an accumulator not shown. The slide or cross head 62 is reciprocated by the shaft 59 and has a working fit with the tubular member which extends therethrough.

The blank holder 68 which is carried by the piston 65 is adapted to engage the work and hold it in position on the die 58. The slide 62 has a fixed stroke determined by the length of the crank. The shaft 59 is driven by any suitable means and reciprccates the slide. The work is positioned on the die 58 and as the slide moves downwardly the blank holder 68 engages the work while the forming die continues its downward movement and produces the drawing operation. As the chamber 71 is in open communication with the accumulator and with the space in back of the piston, it will be seen that the pressure between the blank holder and the die will be determined by the pressure in tl e accumulator. hen the pressure of the blank holder against the die exceeds the pressure in the accumulator, the slide will movewith respect to the piston 65. It will thus be seen that the pressure of the blank holder against the die may be regulated as desired. As the draw press is operated at exceedingly high pressure, it is necessary to provide the rigid connection between the slide and the accumulator and permit movement of the slide with respect to the connection. It will thus be seen that I have provided a connection which will be safe and dependable and which will permit of a variable pressure to be exerted upon the blank holder while maintaining the space behind the piston in constant open communication with the accumulator.

Having thus described my invention, what I claim is:

1. In a machine of the character described,

a shaft, a cylinder slide operatively connect ed with said shaft and having a fixed stroke, a piston slidahly mounted within said cylinder slide, a rigid member disposed adjacent said cylinder slide and extending into said cylinder slide, a bore in said rigid member disposed in constant open communication with the interior of said cylinder slide and means permitting a reciprocation of said cylinder slide with respect to said member.

2. In a machine of the character described, a shaft, a cylinder slide operatively connected with said shaft and having a fixed stroke, a piston yieldably connected with said cylinder slide, a rigid connection extending into said cylinder slide and disposed in constant open communication with the space in front of said piston and permitting a sliding movement of said cylinder slide with respect thereto.

3. In a machine of the character described, a shaft, a slide operatively connected with said shaft and having a fixed stroke, an opening in said slide, a piston slidably mounted in said opening, said slide having a second opening therein in communication with said first opening, a rigid connection extending through said second opening and disposed in open communication with the space in front of said piston, and means permitting movement of said slide with respect to said rigid connection. I

4. In a machine of the character described, a crank shaft, a cylinder slide operatively connected with said crank shaft, a piston mounted in said cylinder slide and adapted for movement with respect thereto, said cylinder slide having an opening therein, a rigid tubular connection extending through said opening and having a bore therein, means connecting said bore with the space in front of said piston whereby the tubular member is disposed in constant open communication with the space in front of said piston.

. In machine of the character described,

a shaft, a slide operatively connected to said shaft, a rigid connection extending through said slide and having a passageway therein, an opening in said slide, a piston slidably mounted in said opening, and means maintaining said opening in constant open communication with the passageway in said tubular connection.

6. In a machine of the character described, a shaft, a slide operatively connected to said shaft and having a fixed stroke, a piston mounted in said slide and adapted for movement with respect thereto, a supporting member disposed adjacent said slide, a rigid member extending from said supporting member and projecting through said slide and having abore therein, and means connecting said bore with the space in front of said piston.

7. In a machine of the character described, the combination of a shaft, a slide operatively connected with said shaft and having a fixed stroke, a rigid tubular connection extending through said slide and permitting movement of the slide with respect thereto, a piston slidably and yieldably mounted in said slide, and means connecting said tubular member with the space in front of said piston.

8. In a machine of the character described, the combination of a crank shaft, a slide connected with said crank and having a fixed stroke, an opening in said slide, a piston slidably and yieldably mounted within said opening, a rigid tubular member extending through said slide and having an opening therein disposed in constant open communication with the opening in said slide and permitting' a sliding movement of the slide with respect thereto.

9. In a machine of the character described, the combination of a crank shaft, a. cylinder slide operatively connected with said crank shaft, a piston slidably and yieldably mounted in said slide, a rigid tubular member supported adjacent said slide and extending therethrough, means forming a constant open communication between said tubular memher and the space in front of said piston and a rigid connection leadin from said tubular member and adapted for connection With an accumulator.

1 0. In a machine of the character described,

-' the combination of a crank shaft, a slide connected to said crank shaft and having an opening therein, a piston yieldably and slidably mounted in said opening, a second opening in said slide, a rigid tubular connection extendingthrough said second opening and permitting movement of said slide with respect thereto, and means providing a constant open communication between said tubular member and said first mentioned opening.

11. In a machine of the character described. a crank shaft, a slide operativel connected with said crank shaft and reciprocated thereby, an opening in said slide, a piston slidably mounted in said opening, a supporting member rigidly supported adjacent said tubular member to align itself with said slide, and a nut on the projecting end of said tubular member to secure the parts in proper ali ment.,

n testimony whereof, I hereunto afix my signature.

ROBERT J. PARDEE. 

